DNS
CVE-2026-20067
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Lifecycle Timeline
2DescriptionCVE.org
Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.
This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.
AnalysisAI
Unauthenticated remote attackers can crash the Snort 3 Detection Engine by sending crafted HTTP packets with malformed Multicast DNS fields, causing a denial of service that interrupts packet inspection across multiple Cisco products. The vulnerability stems from incomplete error checking in HTTP header parsing and requires no authentication or user interaction to trigger. No patch is currently available for this MEDIUM severity issue.
Technical ContextAI
Classified as CWE-787 (Out-of-bounds Write). Affects Snort 3 detection engine. Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.
This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3.
Affected ProductsAI
Product: Snort 3 detection engine.
RemediationAI
Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today